Internal-combustion engine.



L. 1LLMER, Jn. INTERNAL COMBUSTION ENGINE. APPLIOATION FILED JAN.23,1906.

1,057,837. .Patente Api 1, 1913 ATTORNEYS L. ILLMER, JB.

NTERNAL GOMBUSTION ENGINE.

.APPLICATION FILED JAN. 190s,

Patented Apr. 1, 1913.

5 SHBETSFSHEET 3.

' /N/ENTOH Zozzz's filmer Jj:

ATT OHNE YS L. ILLMER, JR.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED JAN. 23, 1906.

l,O57,837. Patented Apr. 1,1913.

SHBBTS*SHEBT 5.

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- sions.

LOUIS ILLMER, JR., or ITHACA, NEW YORK, AssIGNOR, BY DIRECT Ami mesmaAssIGNMnN'rs, 'ro ILLMER GAs ENGINE COMPANY, A CORPORATION or DELAWARE.

INTERNAL-COMBUSTION ENG-INE.

Applicaition tiled January 23, 190. Serial No. 297,405.

-State of New York, have invented a new and Improved Internal-CombustionEngine,

of which the following is a full, clear, and

l exact description.

My invention relates Aparticularly to two Ycycle scavenging enginesusing gaseous fuel,

and its object 1s to secure an increase in 1capacity for the givencylinder dimensions.

lat-tain this end by forcing a portion of the' mixturecharge into thepower cylinder after. the exhaustclosure so' that at the time of theinlet closure the working charge attains -an initial pressureconsiderably above that.

of the atn'iosphere. The mixture charge is thereupon further compressed,ignited and expanded. This increase of the initial pressure results inan increase of the volumetric capacity of the power cylinder, which, inturn, causes an increase in the. mean effective pressure of expansionandadmits voi" a large power capacity for given cylinder dimen In order toovercome the effects ofV the extra heating of the cylinder parts whenworking With the resulting heavy explosive charges, I provide means forscavenging the cylinder thoroughly, so as to avoid, in part, theincreased liability to preignition and back firing involved. For thepurpose of avoiding excessively high explosion pres- Sures, I'prefer towork with a fairly large compression space so as to secure a. relatively`large mean eli'ective pressure in the power cylinder with respectto apredetermined limit of explosive pressure. p

My improvements are especially adapted for-use in connection withblowing engine plants for supplying blast furnaces, particularly whenthe blast .furnace gas is' used as fuel in' the engine. In these plantsit is cu s-' tomary to supply a blast usually ranging from l5 to 25pounds per square inch and since this pressure is Well suited for useWith the present invention, I' proposevin such plants to employ theneeded compressed air directly from the blov'lng engine mains, thusavoiding the necessity of a 'specialv pump for this purpose.

My 4invention also involves certain im-. provements in the means forcontrolling and admitting air and gas as a mixture body,

Specification of Letters Patenti" Patentes Apr. 1,1913.

and air as a body `of scavenging blast to the power cylinder, thearrange-ment being such that the entire portion of the mixture body islpressed completely past the inlet valve and into the power cylinder, bymeans of a body of air at a relatively high pressure. In this manner Iimpart to the Working charge, its relatively high initial pressure,previous to the inlet closure, and, at the same time, supply the conduitleading to the inlet valve with a body of air, which is subsequentiyAemployed to scavenge the power cylinder.

The said improved devices for controlling the air and gas also involve apeculiar method `oi? regulation, according to which the airand gasmixing valve is given a constant stroke, and the* governing is effectedby throttling the air and gas supply to said mixing valve, thisthrottling being preferably accomplished by means of valves ar ranged inthe air and gas conduits and having direct connection with the governorso as to operate said valves simultaneously, the

valves not changing their relative positions. Reference 1s to .be had tothe accompany ing d'rawlngs which illustrate, .as an example of myinvention, a double acting two cycle engine, using a gaseous fuel, :inwindu-- Figure 1-represents a side elevation of the engine. Fig. 2represents a plan view of the same. Fig. 3 is an elevational View withpartsin section, irregularly following the line 3 3 of Fig. 2, saidfigure showing the air andY gas supply ducts, the governingthrottle-valves and their gear and one of the mixing valves and' itsgea-r. Fig. Il is a seo tional View on line st-4 of Fig. 3. Fig. 5 is` asectional elevation showing a modification in the arrangement of ductsfor air and gas, in which modified arrangement three distinct ducts areprovided, one for the gas, one .for the air which is at the samepressure as the gas and intend ed for adinixture therewith, and a thirdfor the scavenging air whichv is at a relatively higher pressure, aswill appear hereinafter. F ig. 6 is a horizontal section showing theadmission-or inlet reo valve and its mounting means. Fig. 7; is an endelevation of the parts shown in Figt, this view also illustrating theposition of the air and gas supply conduits and the mixing valves.

The type of engine here iliustrated is a double acting two cycle engine,and in the mixing valves into the passages, answering the same purposeas check valve 59 in Fig. 3. "With this arrangement the mixing valve 57operating in the casing 56 as before, serves first-to uncover thepassages 46 and 49?, admitting the air and gas to flow through themixing valve and forming a body of explosive charge which flows ontoward the cylinder. Upon the next movement of the mixing valve, thescavenging air, at a relative high pressure referred to, passes themixing valve behind the body of working charge and forces the entirecharge past the inlet valve,'as explained.' The mixing valve may, ifdesired, be arranged completely to close the passages 46a and 49,whilethe scavenging air is flowing from the passage e7, but ithis isnotessential` since the check valves 6l will close under the highpressure of the scavenging air, stopping the flow of gas, and the lowpressure air through the .passages 46 and 49?, lduring the time that thescavenging air. at a high pressure is flowing through the mixing valves.The throttle valves 50 and 51 as shown in F ig. 5, are connected withthe governor and ioperate precisely as in F ig. 3, excepting that thevalve does notl need to beset to throttle the. pressure flowing pastit,owing to the fact that two separate passages, z'; e. 47"L and 49a, areprovided to carry the scavenging air. s In the operation of the engine,assuming the construction' shown in Fig.A 3 is employed, the mixingvalve 57 will move under the action of its operating mechanism to'.

v cover the main part of the passage 47 and .admit gas from the passage46 and air :from

the branch 49 forming a body of explosive mixture of air and gaseousfuel which passes through the duct 60 into the housing 68.

At or before this time, the inlet valve 71 willv be opened by themechanism *provided for the purpose, and a p'ortioi of the mixture bodywill have passed into thelcylinden As soon as the pre-arranged volume ofex-' Y plosive 'mixture is formed by the valvel 57,-

said valve operates to cut oil' the gas supply.

and admit the high pressure scavenging air from the main part of thepassage47; at

Athe same time the exhaust port/will havel closed. This scavenging airpasses through the duct 60 into the housing 68 vandforces; all

of the remaining portion of the mixture body past the inlet valve 71into the cylin fessure der and against the compression created by thepiston movement. A er this takes place the inlet valve closes, thepiston continues its compression -stroke, then the spark'is passed andthe expansion stroke follows. ist the end of the expansion stroke theexhaust ports are uncovered and the inlet-valve 7l again opens, firstadmitting the body of scavenging air lying back of it, so as to scavengethe cylinder of the burnt gases, after which the mixture body-followsand the above described operations are repea-ted in the order given.

The operation is the same in all essential particulars when thestructure shown in Fig.'-

piston, a supplyof gaseous fuel, a supply of air -at two pressures, oneapproximately equal to that of the gas and theother materially higher,means communicating with the inlet port to measure, and let'forward,

alternately into thepower cylinder, first a body of scavenging air-tocleanse the sam'e, Said means opening the. gas'supply. and thelowpressure air supply to forma mixture body of air and gaseous fuel and.allowing -such mixture body to follow the scavenging air body, saidmeans subsequently closing the gas supply and opening the high pressureair supply to force the entire mixturebody into the power cylinderjduring the early part of the piston compression period.

2. In an explosive e-gine of the compressiontype, .the combination of apower cylinder having an inlet and an exhaust port, a piston, a' supplyof gaseous fuel, a supply of air at a pressure materially higher thanthat of the gas supply, means communicatforward alternately into thepower cylinder,

first a body of scavenging air, then a supplyv of gas and throttled airto forma.v mixture' body of air and gaseous fuel and allowing a portionof such mixture body.to follow the scavenging air body, said meansSubscquently closing the gas supplyand opening fully the air supply toforce` .the entire mixture body into the cylinder during'the early ipart of the piston compression period.-

3; In an explosive engine of the compresinder having an inlet and anexhaust port, a

ing with the inlet port to measure, and let i Vsion type, vthecombination of a power cylpiston adapted to compress`the explosive 'imixture before its ignition period, a supply of gaseous fuel, a supplyof amat a pressure materially higher than that of the gas supply, aconduit means discharging to thev inlet port, means at the receivingend'of said conduit to measure, and let forward alternately through saidconduit and into the cylinder, first a body of scavenging air; Y

then a supply of gas and a supply ofA air at relatively low pressure toform a mix- Ature body of air and gaseous fuel, and allowing a portionof such mixture body to follow thegscavenging air body into thecylinder, then a supply of air under relatively' highI pressure to forcethe entire mixture body into the cylinder during the early part ofthepiston Compression perio of a ower cylinder .1

an inlet anc?. an

pp'ly of gaseous gue-saure mexerieily gas supply,' means et port Tomeastiie uli' ply i. of air and g .t it' -..l and ellowin a .portion ofsuoli V.mixture body to' fol ow the scavenging :iii- `oo1y into 'theCylinder, said means su nenty cie-sing the gas supply Milly elle nii'supply to force the #um o mixture. body meer alluring the early part ofthe piston compressionperiod, and `z a, govei'nor `controlled means forregulating theA volume of mixture body in :Noorda-nce with the lomiofQ1-ne engu 5. In en explosive. e

me he combination :ng an inlet-.and an exhaust port, u piston adapted tocompress the exilosive mixture. body .before itsignii ir'od, n si i fnpply, a conduit means .Tg1-ng Je 'me ine't port, means at the receivingend of seid conduit to measure, und let forward alternately throughseidv ronduit and into tlie power cylinder, first e. bodyfo scavengingair. seid ineens then opening tne gas supply and th'rottling the air'supply to form e mixture body of eil' and gaseous fuel and elvowing such,mixture body to folloi'wv (he semenging body'into the conduit. means;Ineens subsequently closing the ges supplyend opening fully the nii'supply to force said mixture body into the' cylinder duringtlie early'part of the piston compression periofl, and means for the combinationsure, which bodyof air constitutes the soar-.f-

-sion type, the com and gaseous fuel'.v and "allow-ing'e'LA of gaseousfuel, e. are materially higher' maintaining a boy of air seicl conduitmeans during tbe-whole period oi inlet cloen ing nir body for thesucceeding mixture 6. In an explosiyeengine cfg-the compresb" o powercylinderv having an inlet endfn'ellieustf' rt,'a..ps'ton, a supplyoi-uel, agsupp y of airat e pressurein' egieily-lhigher'than that of tnegagv m minuniea'tingr'witli the inlet port to m iid-let fol-'Werdalternately into thecy ,1 iii-"st a body of; scavenging 1n air, saidmeans then lthrottlixjlg the-aix" snp,v ply and opening'tie'gas Supplyt0 form, et a low pressure, e mixtiufbodv' oi-Lair vvnt'xty, suicient tofill the cylinder,.of-suolil ln xixtueV and, fter the exhaust 'pont isclosed, eliod'yf "l of air under relatively high pressuref-toV force theentire mixture body; into thev'o'yllVv inder. I

Q'In testimony whereofA I hatvelfsgnedmy name to this specification-inthe presencel of Y twosubscribingvsrilinesees. i -"-1: .ff-

EDW. J'. Mone7 Somier. B. Borge'.

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